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AS27066United States Department of Defense (DoD)

United StatesRegistryARIN

As of 22nd October 2026, AS27066 (United States Department of Defense…), a network registered in the United States with ARIN, originates 110 IPv4 prefixes covering 35.8k addresses and 8 IPv6 prefixes. By IPv4 address space that makes it the 5,170th-largest of the 79,655 networks we see originating IPv4, and the 1,787th-largest of 18,475 in the United States. It is seen behind 2 upstream networks, most often AS721 (United States Department of Defense…) and AS27064 (Defense Information Systems Agency…), and in front of 31 downstream networks. None of its announcements have a valid RPKI ROA. 100% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

110

IPv6 prefixes

8

IPv4 addresses

35.8k

IPv6 /64s

524k

Upstream graph

The networks AS27066 is seen behind, one and two hops out, drawn from real AS paths.

AS27066Toward the internet core
Upstream graph for AS27066: 3 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS27066United States Dep…This networkAS721United States Dep…AS27064Defense Informati…AS3356Lumen (Level 3)

Networks observed one and two hops upstream of AS27066 in real AS paths. A thicker line means more vantage points saw that adjacency, so weight tracks how well attested it is — not how much traffic it carries. Adjacency is an observation; whether it is a transit purchase or a settlement-free peering is an inference, and is labelled as one wherever we show it.

Neighbouring networks

67

adjacent networks

Upstreams
23%
Peers
3451%
Downstreams
3146%

Networks carrying this one's traffic toward the rest of the internet.

Upstreams of AS27066
NetworkCountryRelationshipPathsVantage pts
AS721United States Department of Defense (DoD)USPeer103,935140
AS27064Defense Information Systems Agency (DISA)USPeer7777

Prefixes

All 118

The largest blocks AS27066 originates, widest first.

Largest prefixes originated by AS27066
PrefixAddressesVisibility
163.251.96.0/221k77/77
163.251.244.0/221k77/77
214.29.156.0/221k77/77
214.48.12.0/221k77/77
214.48.72.0/221k77/77
214.48.76.0/221k77/77
214.48.108.0/221k77/77
214.48.116.0/221k77/77
214.54.128.0/221k77/77
164.234.108.0/2351277/77

Routing health

How AS27066's own announcements validate against RPKI and how far they propagate. The same measures for the whole routing table are on the routing table in numbers.

RPKI origin validation

  • Valid0.0%0
  • Invalid0.0%0
  • No ROA100.0%118

Propagation

  • Globally propagated90% of full-feed peers or more100.0%118
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 110 prefixes

IPv6 — 8 prefixes

  • /4865.5k × /64100.0%8

Recent changes

Announcements that started or stopped since 22nd Sept 2026.

Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.